DE2833003A1 - POLYOLEFINAL RESIN PREPARATION AND ITS USE - Google Patents

Description

The present invention relates to new polyolefin resin preparations and to a method of making adhesive polyolefin films therefrom.

Adhesive films are used in various fields, e.g. for food packaging. They are particularly suitable as wrapping films for household use or as stretch films for business use. They are further suitable as so-called masking films for decorative sheet materials, steel plates, etc.; the range of possible uses is very wide. Most commercial packaging or stretch films are made from vinyl chloride-based resins, such as polyvinyl chloride and polyvinylidene chloride. However, these resins have several disadvantages: they are difficult to burn and destroy because they emit harmful gases when burned.

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To overcome these drawbacks, research has turned to the use of chlorine-free resins in making adhesive resins Movies. Although various chlorine-free resins can be made into films with good self-adhesive properties, the production cost of these films is relatively high because the resins are not "commonly used resins".

The interest has therefore turned to the use of inexpensive polyolefin films as the adhesive film. This is how, for example, the Japanese describes OS 54472/74 the production of adhesive films from a polyolefin resin, mixed with certain proportions of two types of polybutene with different molecular weight distributions and was kneaded. In Japanese OS 27451/77 a preparation made of a polyolefin resin, a polyolefin with low degree of polymerization and a means for tackifying ("tackifier") proposed that an adhesive film with good Provides adhesion and excellent physical strength. It was also found - as can be seen from the Japanese OS 152468/77, that the adhesion of the films obtained from the above preparation is improved after their production by aging.

Although adhesive films of the above type have a favorably high peel strength in the shear direction (i.e. an adhesive strength determined by pulling two superposed films apart in parallel and opposite directions along the film surfaces), their peel strength is 180 ° ( hereinafter referred to as "180 ° peel strength ⁸¹ and which means imprisonment,
strength ^ »determined by peeling off two superimposed

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Films in the opposite direction or vertical to the one on top Film, so that the peeled off part of the film forms an angle of 180 °) unfavorably higher than necessary. Therefore These films have poor packaging properties by adding a once wound film is difficult to separate and manual packaging is difficult. The films also have an unsatisfactory quality Transparency, so that the packaged items often appear cloudy or dark, making them unsuitable for food packaging will. Therefore, there is a strong demand for adhesive films having excellent properties which have the above disadvantages overcome.

The aim of the present invention is therefore to provide one A polyolefin resin preparation which provides an adhesive film without the above disadvantages, which is further characterized by excellent peeling resistance at shear force and a reasonable 180 ° peel strength and excellent transparency.

Another object of the present invention is a method for making these adhesive polyolefin films.

The above objects are achieved by producing a film from a preparation of (a) a polyolefin resin in a mixture with small amounts of (b) a polybutene of low molecular weight and (c) a mixed glyceride having at least one acyl group with 2 to 6 carbon atoms and at least one acyl group bit 8 to 22 carbon atoms. The films formed in this way are then aged. It has been found that the properties of this filee are reduced by the presence of the two in small quantities.

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mixed ingredients are synergistically improved. That is, the film ₉ is indicated by an even better Abpellfestigkeit in the shear direction as compared to a similar film which is made of the same polyolefin resin with only one of the above components, and then aged. Furthermore, the film has a suitable 180 ° peel resistance and a sufficiently high transparency as well as excellent physical strength »

The present invention therefore provides, on the one hand, a polyolefin resin preparation of a polyolefin resin, a low molecular weight polybutene and a glyceride mixed with at least one acyl group with 2 to 6 carbon atoms and at least one acyl group with 8 to 22 carbon atoms

Further, the present invention provides a method for producing a polyolefin film _p which is characterized _s that a film of a polyol to finharzpräparat of (a) a polyolefin resin, (b) a polybutene of low molecular weight, and (c) a mixed glyceride having at least one AöylgFüppe with 2 to 6 carbon atoms and at least one acyl group with 8 Ms forms 22 carbon atoms and then ages the film.

The charcoal preparation preferably also contains a surface wetting agent.

© ti δΐ§ Main component of the preparation according to the invention

W§Mete polyolefin resin can be commercially available polyethylene, polypropylene, an ethylene / vinyl acetate mixture polymer, polybutene- 16 in a similar resin. These resins may be singly or

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used in combination; they expediently have a melt index of from 0.2 to 10, preferably from 0.5 to 7. That commercially available polyethylene suitable according to the invention comprises copolymers of ethylene with small amounts of other olefins, such as propylene, butene and similar monomers copolymerized therewith. The commercial polypropylene can accordingly Interpolymers of propylene with minor amounts of other olefins such as ethylene, butene, etc. include.

Preferred resins are high pressure polyethylenes with a density of 0.91 to 0.93 (i.e. low density polyethylene) or Ethylene / vinyl acetate copolymers with a vinyl acetate content of 1 to 20% by weight and a density of 0.91 to 0.94.

The low molecular weight polybutene useful in the present invention (hereinafter referred to as "polybutene") should have a number average molecular weight of 450 to 3000, preferably 550 to 2500 and especially from 1000 to 2500 have. Polybutene and polyisobutylene can be used individually or can be used in combination. Furthermore, two or more kinds of polybutene or polyisobutylene with different Molecular weight distribution can be used.

The mixed glycerides with at least one acyl group with 2 to 6 carbon atoms and at least one acyl group with 8 to 22 carbon atoms are compounds in which one of the three hydroxyl groups of glycerol with a lower fatty acid with 2 to 6 carbon atoms and the other is esterified with a higher fatty acid with 8 to 22 carbon atoms, with the other hydroxyl group

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either remains free or with a lower fatty acid with 2 to 6 carbon atoms or a higher fatty acid with 8 to 22 carbon atoms is esterified. For example, diacetin or triacetin compounds are suitable for this purpose.

In the case of triacetin compounds, all acyl groups can be different. The higher fatty acids usable for the above purpose can be saturated or unsaturated, provided they have 8 to 22, preferably 10 to 18, carbon atoms. As lower Any fatty acid with 2 to 6 carbon atoms is suitable.

Mixed glycerides are e.g. Diacetyl-Monolauryl-Glycerin, Diacetyl-Monopalmityl-Glycerin, Diacetyl-Monooleyl-Glycerin, Monoacetyl-Dilauryl-Glycerin, Monoacety1-Monopalmity1-Glycerin, Monoacetyl-Dioleyl-Glycerin, Monoacetyl-Monolauryl-Glycerin, Monoacetyl-Monooleyl-Glycerin, Dipropionyl-Monoleyl-Glycerin, Dicaproyl-Monolauryl-Glycerin, Dicaproyl-Monopalmityl-Glycerin, Monoacetyl-Monocapryl-Glycerin, Monoacetyl-Monobrassidyl-Glycerin, Monopropyl monobrassidyl glycerine, monoacetyl monoerucyl glycerine etc. These mixed glycerides can be used singly or in combination.

As mentioned, the preparation according to the invention can furthermore optionally contain (d) a surface-active wetting agent. Suitable wetting agents are usually surface-active agents, such as polyoxyethylene alkyl ethers, polyoxyethylene fatty acid esters, Sorbitan fatty acid esters, sodium dialkyl sulfosuccinate, higher fatty acid esters of glycerol with one or more acyl groups with 8 to 22 carbon atoms. These compounds can be used individually or

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can be used in combination. The higher fatty acid esters (mono- or diesters) of glycerol are preferred, lauric acid, palmitic acid, behenic acid, oleic acid, linoleic acid, ricinoleic acid, stearic acid, etc. being used as the higher fatty acid, or higher fatty acid esters of a dimer to pentamer of glycerol, ie using polyglycerol of the above fatty acids. Given that the wettability remains for a long time, the higher fatty acid esters of polyglycerols are most preferred. The higher polyglycerol fatty acid esters preferably contain about 50 % by weight of a monoester and the remainder a di- and / or triester, especially when diglycerol is used as the polyglycerol .

The polyolefin resin preparation according to the invention comprises (a) the polyolefin resin in a mixture with (b) the polybutene with low molecular weight, (c) the mixed glyceride and (d) the wetting agent (as required) in the following proportions: 98.6 to 89 wt. % Polyolefin resin; 1 to 6% by weight, preferably 2 to 5 % by weight , polybutene; and 0.4 to 5 % by weight, preferably 0.5 to 3% by weight, mixed glyceride. The wetting agent is used in amounts below 2% by weight, preferably between 0.1 to 1% by weight of the preparation.

Especially when the amount of mixed glyceride is over 1 Weight-96, but is within the range defined above, the polybutene to be mixed with the glyceride should have a number average molecular weight between 1000 to 2500 have.

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Lesser amounts of low molecular weight polybutene or blended glyceride add to the film being made no suitable bond strength or good transparency.

However, if higher amounts of polybutene are used, then this has The melt index of the preparation is too high, which causes the blister (i.e. in the Inflation process an expanded tube that is extruded from the nozzle and inflated by pressurized air is subject to a shaking movement. This makes the resulting film inconsistent in thickness, and its physical Strength is reduced. Such a film has the further disadvantage that its 180 ° peel strength is too great, whereby its suitability as packaging material is reduced.

Larger quantities of mixed glyceride do not provide a crucial one Advantage, but are uneconomical and impair the deformability of the film.

Becomes a . thick film using polybutene and mixed If glycerin is formed in the same concentrations, then these components tend to get off the film surface in larger amounts "bleed out". The appropriate concentrations are therefore in the lower part of the above range when making thick films will. Usually the concentrations should be chosen depending on the type of film.

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The surfactant usually also serves as a lubricant. The use of large amounts of wetting agent improves the surface wettability of the film not necessarily to a considerable extent. On the contrary, such large amounts are not only uneconomical, they also impair the adhesion somewhat of the film obtained. However, the agent is expediently in a suitable amount within the above-mentioned range Resin preparation added to prevent the film surface from becoming cloudy from the water droplets deposited thereon impede. Similar to the polybutene or the mixed glycerides, the surface wetting agent tends to stick to the film surface to migrate and allows a uniform wetting of the film surface with moisture over a long time without lead to the formation of larger amounts of water droplets.

The usual polyolefin additives such as UV absorbers, heat stabilizers, lubricants, antiblocking agents, antistatic agents or wetting agents will.

In the manufacture of the preparation, the polyolefin resin, Polybutene and mixed glyceride and, if necessary, the surfactant can simply be mixed together. in the generally, however, the ingredients are placed in suitable equipment such as a Banbury mixer, a continuous one Mixer or a kneader, kneaded.

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The polybutene, the mixed glyceride and the surfactant do not necessarily need to be mixed in the above-mentioned concentration ranges in the initial mixing stage. Mixing can be done with a so-called basic approach system, in which a basic approach with a high concentration of polybutene, mixed glyceride and surface wetting agent first and then further with the remaining polyolefin resin is mixed prior to film formation. It should be noted, however, that in a basic approach with extremely high concentrations the sub-ingredients kneading before film formation can become unsatisfactory.

The kneaded preparation is then formed into a film in a known manner, for example by blowing or T-nozzle method and this is then aged into an adhesive film.

In the manufacture of "films having excellent physical strengths by the inflation or blow-extrusion process, the expansion of the film must be carried out at an expansion ratio above 4, preferably 5 to 7, and particularly 6 to 7. The term" expansion ratio ¹¹ means the ratio of the circumference of a final blown film, ie a flat width χ 2 to the circumference of the nozzle slot. If the diameter of the nozzle slot is given as D

and assume the lay-flat width as L, then the expansion ratio is expressed as 2L / WD. To make a Flat or puffed film with such a bohemian puff ratio the polyolefin resin preparation is melted in an extruder and from the nozzle slot in the form of a cylindrical

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Extruded hose. Then, air is introduced into the tube to a predetermined expansion ratio, whereby an ^{inflated tube (hereinafter referred to as "bladder 11} ") is obtained. The bladder is then nip rolls.
^ Subsequent stage headed. The inflation is preferably carried out in two stages: first, the cylindrical tube is inflated to an inflation ratio of 2 to 4 and then to a final inflation ratio above 4. If the final expansion ratio is less than 4 with a smaller amount of air entrapped, then the obtained

neither
Adhesive polyolefin film / good break or tear resistance Sn in the circumferential direction (or in the transverse direction) still good tear strength (or resistance to tearing in the longitudinal direction) parallel to the direction of pull. Such films tend to tear when packaged. Since, according to the invention, the expansion takes place at such a high expansion ratio, the film-forming device should expediently be provided with suitable bubble-stabilizing means in order to avoid undesired "breathing" or zigzag movements of the bubble. It should be noted that unless the film is required to have high mechanical or physical strength, the expansion ratio need not be critically limited.

The film thickness is less than 100 / rev, preferably 10 to 50 / rev. If the film is used as a packaging or stretch film, then the thickness is preferably between 10 and 30, optimally between 12 and 20, / rev.

-JfI-

An important feature of the process of the invention is the aging of the film. Although polybutene and the mixed one Glyceride contributes to the improved transparency by synergistic effect, this leaves something to be desired.

In order to produce a film with improved transparency and excellent shear peel resistance, the film must be aged immediately after its manufacture.

The degree of aging depends on the temperature of the Agingatiao sphere and the aging time. Usually, the formed film is aged by keeping it in a long time Leaves the atmosphere to stand at a relatively low temperature or places it in an atmosphere of relatively high temperature for a short time. In order to prevent the mechanical strength of the formed film from deteriorating, the film is preferably kept in an atmosphere aged relatively low temperature. Is the temperature but too short, then a very long aging time is necessary to give the film a high degree of adhesive strength, which is unfavorable from an economic point of view. In terms of productivity, an aging in a high temperature atmosphere is preferred. However, too high a temperature leads to the decomposition of the film and to the Disappearance of the molecular orientation, which can cause the film to break.

If the aging takes place in an atmosphere relatively lower Temperature, then the desired level of peel resistance is achieved with shear force and transparency preferably by controlling the aging time, the temperature of the

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Atmosphere is kept constant. On the other hand, if the aging takes place in an atmosphere of relatively high temperature, then it will Appropriately controlled from an operational point of view, the aging time being kept constant.

In particular, when the film is formed by the inflation method, the tubular film is formed with or without cutting Aged into one or more films using a slitter by (1) placing the film loosely around a roll wraps and leaves him in this state in a thermostat chamber; (2) the film around a core (e.g. a spool or wraps a paper tube and then lets it stand in the thermostat chamber; or (3) the film continuously without Initiates winding in an isothermal atmosphere in which the film remains for a predetermined time, during which the heat treatment takes place.

The aging conditions of temperature and time will vary depending on the particular process used. In process (1) the film is for example, 2 hours to 2 days at 20 ° C, 20 minutes to 4 hours at 40 ⁰ G. Aged for 2 to 40 minutes at 60 ^° C. and a shorter time at higher temperatures, for example 10 seconds to 5 minutes at 70 to 90 ^° C. In this condition, however, aging does not usually take place above 70 ^° C. (although there are exceptions). This is because it is almost impossible to uniformly impart shear peel strength and transparency to the entirety of the film in a short time. In practice, the film wrapped around the reel becomes

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preferably 2 minutes to 2 days in a temperature atmosphere of 20 to 6O ⁰ C. aged.

In process (2) aging at temperatures over 35 ⁰ C. should, however, be carried out under 12O ⁰ C.. The film is left to stand ^{at 40 °} C. for 4 hours to 3 days ^{and at 60 °} C. for 40 minutes to 12 hours.

In process (3) the film is heat-treated by continuously for at least 5 seconds in an atmosphere of 60 to 150 ⁰ C, preferably 80 to 120 ° C., It initiates. The film is pulled out of the atmosphere “before it is heated to its melting temperature, and wrapped around a core such as a spool or a paper tube. When using an atmospheric temperature of 100 ^° C., a residence time of 10 to 60 seconds is sufficient. With continuous aging of an adhesive film, it becomes 80 to 120 ° C for 5 to 120 seconds. heated. A suitable device for continuous aging is, for example, an oven heated by an IR heater or hot air. The heat treatment is carried out by passing the film through the oven.

To produce a film with a particularly desirable degree of transparency and peel resistance in SdMrrichtunj = ,, the aging is preferably carried out in an atmosphere at a temperature between 20 to 120 ⁰ C ₀ for a time selected according to the temperature used. Of the three methods described above, method (3) is for thermally treating a film by continuously introducing it into a film

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Atmosphere of a temperature in which the film for a predetermined Can remain indefinitely, industrially advantageous because the treatment time is short and the procedure is simple. The methods (1) to (3) can be used in combination; for example, the film can be produced continuously by process (3) and then further aged according to method (2). During aging, the low polymerized migrate Polybutene and the mixed glycerite on the film surface.

The excellent properties of the film formed from the resin preparation according to the invention are presumably based on the synergistic properties Effect of polybutene and mixed glyceride. A film made by mere film formation without aging has However, not the very satisfactory physical properties. According to the invention, it is particularly useful aging the formed film under the conditions described above, thereby producing the following excellent effects can be achieved:

The aged film shows excellent peel resistance in Shear direction and a suitable 180 ° peel strength as well as very good transparency and excellent physical properties Strength compared to films made from a polyolefin resin preparation containing either only a mixed glyceride or poly-

(minor component) butene as a sub-component / contains and then in the same way

is treated.

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The adhesive film produced according to the invention does not need any additives in order to be used as a stretch film or as a packaging film for food to be suitable.

Further, the film obtained from the polyolefin resin preparation mixed with a surface wetting agent shows an excellent one Wettability, which makes it suitable as a packaging film for perishable foods that require a high degree of wettability, is particularly suitable.

If it is applied in practice as a stretch film or packaging film, the adhesive film according to the invention expediently has the following adhesive and physical strengths, determined by the measuring method described below for tight packaging is more than 0.4 kg / cm ² and the 180 ° peel strength, which is a measure of the suitability for packaging operations, is less than 4 kg / 50 mm, preferably less than 2.5 kg / 50 mm. The transparency, expressed as the degree of surface haze, is less than 2 %; preferably below 1.3 %, s # that the objects packed with the transparent film are clearly visible, which improves their value.

The following examples illustrate the present invention, without restricting them. The adhesive polyolefin films were used to determine their physical properties tested according to the following test procedures «

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-r-

Adhesive strength

Peel strength in the shear direction and 180 ° peel strength Two films are easily placed in a thermostatic chamber at 20 ° C. superimposed and 3 times by means of a roller of 25 mm diameter and 150 mm width pressed together with a gap pressure of 0.3 kg / cm. Within 5 minutes the Both films were examined in an Instron tensile tester in order to peel off the films in the shear direction and at an angle of 180 ° to determine the necessary forces.

Measurement conditions

Peel strength 180 ° Peel strength in

'Direction of shear

Train speed 300 mm / min 300 mm / min

Lengths between chucks ("chucks";

Sample width 25 mm 50 mm

Adhesion area 25 x 25 mm 50 χ 50 mm

Unit kg / cm g / 50 mm

transparency

The haze for evaluating transparency was measured according to ASTM Method D1003-52T.
Fraction ( "rate of breaks")

On a square truncated pyramid. With a side length in the upper section of 175 mm and in the lower section of 190 mm and a height of 105 mm , two cylinders with a diameter of 80 mm each are placed so that they are parallel to one side of the upper section and in contact with one another with respect to their central axis .

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It becomes a 300 χ 300 mm square test piece of the adhesive Polyolefin film formed so that its longitudinal direction (or direction of drawing of the film) with the direction of the central axis of the Cylinder matches, and the film is at one end at a width of 10 mm at a distance of 10 mm from the top Pyramid surface fixed to the pyramid. Then the two cylinders are covered with the film, the free end of which is in Pulled down longitudinally at a speed of 25 cm / sec to a height of 40 cm from the lower surface of the pyramid will.

The above procedure is repeated for 20 test pieces, and the number, n, of broken pieces is referred to as the "fractional number".

Wettability

300 cc of water at 20 ⁰ C. are introduced into a 1-1 glass beaker, which is provided with the test film and covered in a chamber of a low temperature (3 ° C.). After 10 minutes, the transparency of the test film is evaluated with the naked eye.

The evaluation criteria are as follows:

excellent: the moisture deposited on the film surface is satisfactorily distributed and the entire film surface is uniformly wetted, making the content complete is visible through the film.

good: water droplets up to a size over 3 now grow on the film surface, but the content is almost complete visible through the film.

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bad: very fine water droplets are deposited over the entire film surface, which makes it almost impossible to see the inside of the film.
Example 1 to 11

A high pressure polyethylene ( ^{commercially available as n} Novatec-L, F-100 "from Mitsubishi Chemical Ind., Ltd.) used as the main polyolefin resin component was polybutene having a number average molecular weight of 1260 or 2350, diacetyl monolauryl glycerol (product "PL002 ⁿ Riken vitamin Oil Co., Ltd. commercially available) as a mixed glyceride and diglycerol (as" Rikemal 0-71D "from Riken vitamin Oil Co., Ltd. in the trade ) was added as a surface wetting agent in the proportions shown in Table 1, whereby a polyethylene resin preparation was obtained.

Each preparation was subjected to a film-forming process with a lay-flat hose device (made by Modern Machinery Co., Ltd., Type MKB-6, L / D = 22) provided with nozzles with a slit diameter of 50 mm at a forming (or subjected cylinder) temperature of 16O ⁰ C. at a Aufblähverhältnis of 6.5 and a winding speed of 15 mm / min, thereby obtaining a 16 thick yu adhering polyolefin film.

After completion of film formation, the films were wound around a roller loose and in this state in a thermostatic chamber for 24 hours at 20 ⁰ C or 40 ° C. aged. The one so aged

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Film was used to determine its peel strength in the shear direction, the 180 ° peel resistance, its haze and its wettability =, the results are in Table 1 shown.

The above procedure was repeated with resin preparations in which the same kinds of polybutene and mixed glyceride as above, but were added to the polyethylene resin in proportions not according to the invention. The films obtained were in tested as described above. The test results are shown in Table 1 as comparative examples Table do the abbreviations used in the column for "Composition" have the following meanings? PE = polyethylene resin

PB s = low molecular weight polybutene KG = mixed glyceride SA = surface wetting agent

No Composition .; Weight KG PB mole
kular
= 1260 mole
kular
won. "
= 2350 .-% AIt.-
temp. Table I. ; 2 hrs 24 hrs 1.30 1.35 180 ° peel-off
speed (q / 50 mm) 2 hrs 24 hrs Veil (%) tj 2 hrs 5.2 4.8 3.8 24 hrs Bruc 0 I— Wetting ι i 1 PE 1 3 0 SA ( ⁰ C) 0.86. 1 * 55 1.57 solort 1.8 sofori ⁸ . ^4th 4.7 3.9 0.9 number 0 bark. I. I.
I. 2 95.6 1 3 0 0.4 20th Peel strength in
Shear direction (kg / cm) 0.83 0.91 'after
Movie
image. 1 * 7 1.8 ' after
Movie
image. 1.0 0.8 i 0 excellent I. I. 3 95.6 1 3 0 0.4 .40 'sof or1 0 ^ 87 0.91 1.2 1.8 1.8 2.3 1.0 1.2 0 η 4th 96.0 1 ^ '5 0 0 20th after ■
Movie
image. 0, R7 1.32 1.2 1.6 _2> 3 2.3 1.2 0.7 0
0 bad υ * 5
6th 93.6 1
1 0
0 3
3 0.4 20th 0.57 1.23 0.52
0.55 1.3 2.4 1.7 2.5 0.8 1.1
1.0 0 excellent ι p ^ 7 95.6
95.6 1 0 3 0.4
0.4 20th
40 0 ^ 57 0.50
0.51 0.63 1.4 1.6 1.8 2.1 1.0
1.0 1.2 0 η
π to
O 96.0 1 0 5 0 20th 0.58 0.58 1.25 1.2
1.2 1.8 3.6 2.2
2.2 ;, 2 1) 1 0 bad (O
00 • Η 9 93.6 2 3 0 0.4 20th 0.67 1.18 0.58 1.3 3.1 1.5 2.5 1.2 0.6 0 auegez. O
O » (= 10 94.6 2 5 0 0.4 20th 0.42
0.42 0.56 1.08 1.6 M. 1.9 2.3 0.6 0.5 0 η 11 92.6 2 5 0 0.4 20th 0.48 0.96 1.18 1.0 1.8 1.9 ι, ⁵ 0.6 0.5 0 Il > cn 1 92.6 1 0 0 0.4 40 0.51 1.01 0.15 1.3 1.9 1.2 1.4 0.5 I) ⁹ 0 η 5,
/ Ά 2 98.6 1.5 0 0 0.4 20th 0.39 0.13 0.11 1.3 1.1 0.9 1.4 2.0 1.6 0 excellent t / 7
TJ 3 98.1 2 0 0 0.4 20th 0.48 0.11 0> 15 1.1 0.8 0.8 2.2 1.6 1.1 0 η. m 97.6 3 · 0. 0 0.4 20th 0.48 0.14 0.07 0.8 0.7 0.5 I, ^7th 1.1 0.7 I ⁵ 96.6 6th 7th 0 0.4 20th 0.10 0.06 due to instability 0.7 0.5. 1.1 0.7 .FiIn 0 « C i ⁶ 86.6 0 0 3 0.4 0.08 1.14 0.4. 0.8 »E could not have a uniform 3.6 0 C. 96.6 0 - 0 5 0.4 20th 0.12 1.25 W VY WX
4.9 3.7 distinguished £ > 94.6 0.4 20th 0.06 ' ^Θ 4.3 7.9 η c 6.7

₉ The results of Table 1 show that films of a preparation having a major proportion of polyolefin and a minor proportion of a mixed glyceride in the shear direction have too low Abpellfestigkeit alone without addition of the other two sub-components, while films one of a preparation with polybutene as a sub-component have poor transparency and 180 ° peel resistance and are therefore unsuitable in practice. In contrast, the films obtained from the preparations according to the invention have excellent peeling strength in the shear direction and reasonable 180 ° peeling strengths compared to all films from the preparations with only a mixed glyceride or a polybutene as the only sub-component o This is probably due to the synergistic effect of the mixed Glycerides and Polybutenso If the films obtained immediately after film formation were aged further, their transparency and also their peel strength in the shear direction improved markedly without a significant adverse effect on the 180 ° peel strength.

As can be seen from the above data, the adhesive films made according to the present invention have excellent peeling resistance in the shear direction and a useful 180 ° peel strength and excellent transparency. This means, the adhesive films obtained from the preparations according to the invention are very suitable for packaging and ensure a © tight packaging of the item. The films ensure good handling in the packaging company, and the ver packaged good looks and are therefore particularly suitable for use as stretch or film wrapping films for Food. 909808 / 07B3

Example 12 to 14

According to Example 1, the same polyethylene resin preparation (PE = 95.6% by weight; KG = 1% by weight; PB / numerical average Molecular weight = 1260-7 = 3 wt .-? 6) a polyolefin film manufactured.

Then, the film was continuously placed in an aging chamber maintained at the temperature shown in Table 2 without being wound up introduced around a core or a role. The aging took place for 30 and 60 seconds. The film thus aged was tested for peel strength investigated in the shear direction, 180 ° peel strength, transparency and fractional number. The results can be found in table 2.

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Table 2

Belsp. AIt, -
temp.
⁰ C. Abpellfest, in
Scherr. (kg / cm ² ) 30th
sec. 60
sec. 180 ^u Abpellfestißk.
(g / 50mm) 30th
sec. 60
sec. Veil; % 30th
lake. 60
lake. Fractional number
- (%) 12th
13th
14th 50
70
90 immediately
after
Movie
image. 0.80
0.85
0.88 0.83
0.89
0.91 immediately
after
Movie
image. 1.7
h ⁷
1.8 1 ^ 8
1.8 immediately
after
• FiIm-
'•image. I ₁ I
1.0
1.1 1.0
0.9
0.9 0.57
0.57
0.57 I ₁ ²
1.2
1.2 2.3
2.3
2.3 0
0
0

CO CO O

Claims (1)

Claims (c) a mixed glyceride with at least one acyl group with 2 Ms 6 carbon atoms and at least one acyl group with 8 to 22 -C atoms. 2. Polyolefin resin preparation according to claim 1, characterized in that that the content of polyolefin resin is between 89 to 18.6% by weight of the preparation. 3.- polyolefin resin preparation according to claim 1, characterized in that that the polybutene content is between 1 to 6% by weight of the preparation. 4.- polyolefin resin preparation according to claim 1, characterized in that that the content of mixed glyceride is between 0.4 to 5 wt .-% of the preparation. 5 - polyolefin resin preparation according to claim 1, characterized in that that the polyolefin resin is a high pressure polyethylene having a density of 0.91 to 0.93. 6.- polyolefin resin preparation according to claim 1, characterized in that that the polybutene has a number average molecular weight of 450 to 3000 7.- polyolefin resin preparation according to claim 1, characterized in that that it still contains a surface wetting agent in an amount not exceeding 2% by weight of the preparation. 909808/0753 ORIGINAL INSPECTED 8.- polyolefin resin preparation according to claim 7? characterized, that the surface wetting agent is an ester of glycerin and a higher fatty acid or an ester of a polyglycerin and a higher fatty acid is » 9.- A method for producing a polyolefin film, characterized in that a film is formed from a polyolefin resin preparation according to claim 1 and this ages ^{at temperatures of 20 to 12O 0 Co.} 10.- The method according to claim 9, characterized in that the polyolefin resin preparation further comprises a surface wetting agent in an amount not exceeding 2 wt .- $ of the preparation. 11o = method according to claims 9 and 10, characterized in that the film is aged ₅ by being loosely wound around a roll and left in this state ^{at a temperature of 20 to 60 ° C.} 12o ~ _s method characterized in that the film is aged by determining winds it around a core and allowed to stand so at a temperature of 35-120 ⁰ C ₀ claimed in claim 9 and 10. FIG. 13.- The method according to claim 9 and 1O _8, characterized in that the film is aged by continuously introducing it into an atmosphere at a temperature of 60 to 150 ° C _e 14. Method according to claim 13 _8, characterized in that the film is aged for 5 to 120 seconds at a temperature of 80 to 120 ^{° C.} The patent attorney 909808 / 07S3